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Consider a cross to investigate the pea pod ure trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation bred from true-breeding stock, approximately how many constricted-pod plants would you expect to have?

a) 162
b) 65
c) 488
d) 325

1 Answer

3 votes

Final answer:

By applying Mendel's 3:1 ratio of dominance to recessiveness, for the 650 inflated-pod plants observed in the F2 generation, we expect 217 constricted-pod plants. Option E.

Step-by-step explanation:

To investigate the pea pod texture trait with constricted or inflated pods following Mendelian genetics, we consider that inflated pods are dominant.

Given that 650 inflated-pod plants are observed in the F2 generation, we can apply the expected 3:1 Mendelian ratio of dominant to recessive phenotypes to predict the number of constricted-pod plants.

In a Mendelian 3:1 ratio, for every 3 plants with the dominant (inflated pods) phenotype, there is 1 with the recessive (constricted pods) phenotype.

So, if there are 650 inflated

We would expect a total of 650 + (650 / 3) = 650 + 216.67

We round to 217, giving us a total of 867 plants

To find the number of constricted-pod plants

We subtract the number of inflated-pod plants from the total:

867 - 650 = 217 constricted-pod plants.

Hence, the right answer is option E. 217.

The complete question is:

Consider a cross to investigate the pea pod ure trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation bred from true-breeding stock, approximately how many constricted-pod plants would you expect to have?

a) 162

b) 65

c) 488

d) 325

e) 217

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